A book is lifted from the floor and is kept in an almirah. One personn says that the potential energy of the book in increased by 20 J and the other says it is increased by 30 J. Is one of them necessarily wrong?

One person says that the potentil energy of a particular book kept in an almirah is 20 J and the other says it is 30J. Is one of them necessarily wrong?

When you lift a box from the floor and put it one an almirah the ptotential energy of the box increases, but thre is no change in its kinetic energy. Is it a violation of consevation of energy?

Consider the two cases: a. A says that the potential energy of a book placed on a shelf is 10J . b. B says that the potential energy of the same book is -10J . Which one of them is wrong? Justify.

The work done in moving a charge from one point to the other is 20J. If the potential difference between the points is 10V, the charge is:

Method 5 of W Heat taken from a gas in a process is 80 J and increase in internal energy of the gas is 20J. Find work done by the gas in the given process.

A block of mass M is hanging over a smooth and light pulley through a light string. The other end of the string is pulled by a constant force F. The kinetic energy of the block increases by 20 J in 1 s:-

Consider a gas filled in a part of thermally insulated vessel with frictionless insulated piston (connected to a massless spring). Natural length of the spring equals length of the vessel. For 30 J of heat supplied, internal energy of gas increases by 25 J. find the number of atoms in one molecule.

Direction: Read the following information carefully and answer the questions that follow. There are seven persons namely J, K, L, M, P, R, and S. They stay in a building having 7 floors. The lowermost floor is numbered as 1 whereas the topmost floor is numbered as 7, but not necessarily in the same order. They all play different games namely cricket, tennis, badminton, rugby, hockey, football, and polo but not necessarily in the same order. The number of persons staying above and below K is equal. One person stays between the one who plays football and K. R stays immediately above the one who plays football. Only two persons stay between the one who plays cricket and R. Only one person stays between the one who plays rugby and the one who plays cricket. R does not stay on the topmost floor. J stays on an odd-numbered floor above the floor of the one who plays cricket. There are more than two floors between M, who plays hockey and the one who plays tennis. S stays just above L. The one who plays hockey stays somewhere below the one who plays tennis. The one who plays Polo stays below the one who plays tennis. J plays badminton. The following options are similar in some way or the other, select the one that does not belong to the group?

Two identical spherical masses are kept at some distance. Potential energy when a mass m is taken from the surface of one sphere to the other